CVE-2026-31701 (GCVE-0-2026-31701)

Vulnerability from cvelistv5 – Published: 2026-05-01 13:56 – Updated: 2026-05-01 13:56
VLAI?
Title
ALSA: caiaq: take a reference on the USB device in create_card()
Summary
In the Linux kernel, the following vulnerability has been resolved: ALSA: caiaq: take a reference on the USB device in create_card() The caiaq driver stores a pointer to the parent USB device in cdev->chip.dev but never takes a reference on it. The card's private_free callback, snd_usb_caiaq_card_free(), can run asynchronously via snd_card_free_when_closed() after the USB device has already been disconnected and freed, so any access to cdev->chip.dev in that path dereferences a freed usb_device. On top of the refcounting issue, the current card_free implementation calls usb_reset_device(cdev->chip.dev). A reset in a free callback is inappropriate: the device is going away, the call takes the device lock in a teardown context, and the reset races with the disconnect path that the callback is already cleaning up after. Take a reference on the USB device in create_card() with usb_get_dev(), drop it with usb_put_dev() in the free callback, and remove the usb_reset_device() call.
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 4507a8b9b30344c5ddd8219945f446d47e966a6d , < f6634af5de728a46792f674a66d7843570cb68f7 (git)
Affected: a3f9314752dbb6f6aa1f0f2b4c58243bda800738 , < 1d9be95aee6c6246a21752e60c9519902649f482 (git)
Affected: b04dcbb7f7b1908806b7dc22671cdbe78ff2b82c , < 6473ed16df1fe88051140611b3eb9a49be7f429e (git)
Affected: b04dcbb7f7b1908806b7dc22671cdbe78ff2b82c , < 59b622a043cffc58b7638cd85ae6c30a0904f8e6 (git)
Affected: b04dcbb7f7b1908806b7dc22671cdbe78ff2b82c , < 80bb50e2d459213cccff3111d5ef98ed4238c0d5 (git)
Affected: 3993edf44d3df7b6e8c753eac6ac8783473fcbab (git)
Affected: ebad462eec93b0f701dfe4de98990e7355283801 (git)
Affected: 4dd821dcbfcecf7af6a08370b0b217cde2818acf (git)
Affected: cadf1d8e9ddcd74584ec961aeac14ac549b261d8 (git)
Affected: 237f3faf0177bdde728fa3106d730d806436aa4d (git)
Affected: dd0de8cb708951cebf727aa045e8242ba651bb52 (git)
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    Linux Linux Affected: 6.13
Unaffected: 0 , < 6.13 (semver)
Unaffected: 6.6.136 , ≤ 6.6.* (semver)
Unaffected: 6.12.84 , ≤ 6.12.* (semver)
Unaffected: 6.18.25 , ≤ 6.18.* (semver)
Unaffected: 7.0.2 , ≤ 7.0.* (semver)
Unaffected: 7.1-rc1 , ≤ * (original_commit_for_fix)
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nALSA: caiaq: take a reference on the USB device in create_card()\n\nThe caiaq driver stores a pointer to the parent USB device in\ncdev-\u003echip.dev but never takes a reference on it. The card\u0027s\nprivate_free callback, snd_usb_caiaq_card_free(), can run\nasynchronously via snd_card_free_when_closed() after the USB\ndevice has already been disconnected and freed, so any access to\ncdev-\u003echip.dev in that path dereferences a freed usb_device.\n\nOn top of the refcounting issue, the current card_free implementation\ncalls usb_reset_device(cdev-\u003echip.dev). A reset in a free callback\nis inappropriate: the device is going away, the call takes the\ndevice lock in a teardown context, and the reset races with the\ndisconnect path that the callback is already cleaning up after.\n\nTake a reference on the USB device in create_card() with\nusb_get_dev(), drop it with usb_put_dev() in the free callback,\nand remove the usb_reset_device() call."
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    "dateReserved": "2026-03-09T15:48:24.132Z",
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  }
}


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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

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  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
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  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



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